Product Overview – S355JR Seamless & ERW Pipes
S355JR Seamless & ERW Pipes are high-strength structural carbon steel pipes manufactured in accordance with EN 10025 standards for applications requiring superior strength, excellent weldability, and reliable structural performance.
Available in both Seamless Pipes and Electric Resistance Welded (ERW) Pipes , S355JR is one of the most widely specified structural steel grades across the construction, infrastructure, engineering, oil & gas, and manufacturing industries.
The 355 MPa minimum yield strength allows S355JR pipes to carry higher structural loads while maintaining excellent fabrication characteristics. These pipes are widely used in industrial buildings, steel structures, bridges, machinery, offshore platforms, process plants, transmission projects, and EPC contracts throughout the Middle East, Asia, and Africa.
Whether you require S355JR seamless pipes for high-pressure service or S355JR ERW pipes for structural fabrication, we supply complete project quantities with international quality standards, third-party inspection, and fast export delivery.
Standard & International Identification - S355JR Seamless & ERW Pipes
Technical Specifications – S355JR Seamless & ERW Pipes
| Outside Diameter: | 21.3 mm to 660 mm |
| Wall Thickness: | 2 mm to 40 mm |
| Manufacturing: | Seamless / Electric Resistance Welded |
| Length: | 3 M to 12 M |
| Pipe Ends: | Plain End, Bevel End, Threaded End |
| Surface Finish: | Black, Painted, Anti-Rust Coated, Galvanized (on request) |
| Manufacturing Process: | Hot Finished, Cold Drawn, ERW |
| Available Sizes: | ½" , ¾", 1", 1½", 2", 3", 4", 6", 8", 10", 12", 14", 16", 20", 24" |
Custom sizes are available according to project requirements.
Third Party Inspection Available
All specifications are in accordance of EN 10025. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – S355JR Seamless & ERW Pipes
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.24% |
| Manganese (Mn): | 1.60% |
| Silicon (Si): | 0.55% |
| Phosphorus (P): | 0.035% |
| Sulfur (S): | 0.035% |
| Nitrogen (N): | 0.012% |
Note: The balanced chemical composition of S355JR provides high structural strength, good weldability, excellent fabrication characteristics, and dependable performance across a wide range of industrial and construction applications.
Mechanical Properties – S355JR Seamless & ERW Pipes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 470–630 MPa |
| Yield Strength | 355 MPa |
| Elongation | 22% |
| Impact Test | 27 Joules at +20°C |
Note :The excellent mechanical properties of S355JR make it one of the most preferred structural steel grades for engineering, fabrication, construction, and heavy industrial projects requiring both strength and durability.
Testing & Inspection
Applications of S355JR Seamless & ERW Pipes
- Where S355JR Seamless & ERW Pipes are used:
- 🔸Structural Steel Buildings
- 🔸Industrial Construction
- 🔸Bridge Structures
- 🔸Pressure Piping Systems
- 🔸Structural Engineering
- 🔸Industrial Machinery
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Key Advantages of S355JR Seamless & ERW Pipes
Seamless vs ERW S355JR Pipes – Which One Should You Choose?
Choosing between S355JR Seamless Pipes and S355JR ERW Pipes depends on your project requirements.
S355JR Seamless Pipes are recommended for:
- 🔸 High-pressure process piping
- 🔸 Oil & gas installations
- 🔸 Power plants
- 🔸 Steam pipelines
- 🔸 Critical industrial applications
- 🔸 Heavy-duty engineering projects
S355JR ERW Pipes are ideal for:
- 🔸 Structural steel fabrication
- 🔸 Commercial buildings
- 🔸 Warehouses
- 🔸 Bridges
- 🔸 Industrial sheds
- 🔸 General engineering applications